The mysterious labelling has appeared regularly across the show’s nine series and is linked to Jardis and her use of the helicopter, having attributed them to several characters, but fans have been left in the dark about its significance.

In recent scenes, Gabriel Stokes introduced the idea that ‘A’ and ‘B’ refers to a person’s attitude or skills, suggesting that ‘A’ is a leader and ‘B’ is a follower, but this might not be completely true as it also could have something to do with walkers or a person being injured.

The episode What Comes After, which marked Rick’s departure, revealed him to be an A.

At the time, Anne radioed the helicopter saying: ‘I have a ‘B’ not an ‘A’. I never had an ‘A’. He’s hurt, but he’s strong. Can you help him? I’m trying to save a friend. A friend who saved me. I have something for you now. We have a deal? Do we have a deal?’

Showrunner Angela Kang has given a tiny clue into the meaning behind the letters, telling Entertainment Weekly last month: ‘The A and B has something to do with the thing that she was involved in which was human trading, and it was a way to differentiate between classes of people.’

Fans are at a complete loss over the mystery and have vented their frustrations on Twitter with one person blasting: ‘I don’t understand the A’s and the B’s on The Walking Dead.’

‘So… do we know what an A and a B are yet?’ asked another.

Will we ever find the truth?

The Walking Dead airs on AMC in the US and on FOX in the UK. You can also catch up on the show via NOW TV.